I watched the video of this shooting by police on CNN. Two police approaching the man with a knife. The man was seemingly staggering drunk. There did not seem to be any reason that police could not have fired a taser, or pepper spray. There was time to use non-lethal means of subduing the man with the knife. They were in an open street, in front of the store.
If the taser did not work, there was plenty of time and room to fire nine shots. The man with the knife stopped advancing toward the passenger-side officer, after the first shot. The police seemed intent on relying on their pistols as the sole means of reasoning with this obviously irrational individual.